Semicolons, like colons and commas, indicate pauses within a sentence to show relationships between words and clauses. Semicolons are used in the listing of items, but unlike colons, they cannot introduce the list. Rather, they separate items or phrases within a list. Semicolons also link clauses of equal importance, but unlike commas, do not always require a coordinating conjunction.
Linking Independent Clauses
Semicolons can join closely related independent clauses that are not linked with a coordinating conjunction:
- Example: I went to the basketball court; I was told it was closed for cleaning.
- Example: I told Kate she's running for the hills; I wonder if she knew I was joking.
- Example: At the mall I bought four things; my sister bought only two things.
Remember, even though you can join two complete sentences with a semicolon, you should only do it if they have some sort of particular relationship to one another.
Independent Clauses Linked with Transitional Phrases
Semicolons can also be used between independent clauses linked with a transitional phrase or a conjunctive adverb. This is a less common usage, and is mostly confined to academic texts.
- Example: Everyone knows he is guilty of committing the crime; of course, it will never be proven.
- Example: Of these patients, 6 were not enrolled; thus, the cohort was composed of 141 patients at baseline.
Listing Items in a Series
Semicolons are used between items in a list or series when those items themselves contain internal punctuation.
- Example: The people present were Jamie, who came from New Zealand; John, the milkman's son; and George, a gaunt kind of man.
- Example: Several fast-food restaurants can be found within the following cities: London, England; Paris, France; Dublin, Ireland; Madrid, Spain.
- Example: Here are three examples of familiar sequences: one, two, and three; a, b, and c; first, second, and third.
- Example: She stood at the edge, deciding her course of action; changed her mind and walked home.
Formatting with Semicolons
Capitalization
Semicolons are followed by a lowercase letter, unless that letter is the first letter of a proper noun like "I" or "Paris." In some style guides, such as APA, however, the first word of the joined independent clause should be capitalized.
Spacing
Modern style guides recommend no space before semicolons and one space after. Modern style guides also typically recommend placing semicolons outside of ending quotation marks—although this was not always the case. For example, the first edition of the Chicago Manual of Style (1906) recommended placing the semicolon inside ending quotation marks.